CSV ↔ JSON
RFC 4180 parsing with delimiter detection, entirely in your browser.
RFC 4180 parsing with delimiter detection, entirely in your browser.
Splitting on commas breaks the moment a field contains one. This converter implements the
actual RFC 4180 grammar — quoted fields, "" escapes, embedded newlines — and
auto-detects whether your file uses commas, semicolons (hello, European Excel), tabs, or
pipes. Going the other way, fields are quoted exactly when needed, and the header row is
built from the union of keys across all objects, so ragged data survives the round trip.
Everything runs locally. Export a report, paste it here, and get API-ready JSON without the data crossing a network.
No. The parser runs in your browser; spreadsheets full of customer data or internal numbers never leave the page.
RFC 4180: quoted fields, doubled-quote escapes, and newlines inside quotes all parse correctly. Comma, semicolon, tab, and pipe delimiters are supported, with auto-detection based on the first row.
CSV has no types — everything is a string. With typing on, values that look like numbers, true/false, or null become real JSON types. Integers too large for JavaScript to hold exactly (long IDs) deliberately stay strings.
An array of objects (keys become the header row — the union of keys across all rows) or an array of arrays (written as-is). Nested objects inside a cell are serialized as JSON strings.